Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d93f76a52360ead…

MALICIOUS

PDF

45.5 KB Created: 2020-09-01 05:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07fcccf98b9b6ed523e64c19da3ce782 SHA-1: 46ca95da2746077334664202233ae39a51e1713d SHA-256: 6d93f76a52360eadac28603f6ecfcdd851eb45eff25f50daae36341243d0c1f4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is a strong indicator of malicious intent. The heuristic PDF_SEO_LINK_FARM also indicates a large number of outbound links, suggesting a link farm or spamming operation. The presence of a download button lure further supports the malicious nature of the document. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=geometric+measure+theory+a+beginner%2527+s+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/73f3b0_5289283645c94bb8aa97fb8abc34b5c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b199982e9424494faa47077ed883b1b5.pdf
    • https://static.usrfiles.com/ugd/cd79e3_a95ed1ddfa34495cb81dd374e0ae60f8.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/filariasis_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/6902/2109/files/dujomikoxowenad.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/antigone_and_ismene.pdf
    • https://cdn.shopify.com/s/files/1/0459/9844/0605/files/kotor_2_nar_shaddaa_influence_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/11940420979.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/lafegewisafezurazowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1898/4352/files/13828582348.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/mumavigusomozutulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zikoraj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/bemonari.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006528.bin
1fd8f12ad4821d1a074b1c662882d107b98593eb6c09812d019685df0351f53d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5512 bytes
font_01_sfnt_off000077ca.bin
5423e8519b7c1f22590e9da4d8c624e4d6f27d55e1b8b6f244b18e2db6e39205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 10288 bytes
font_02_sfnt_off00009b0f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0F 4324 bytes

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